i read through it all and gotta say it bored me a bit but i managed , but i dnt agree with everything u say, obvi i dnt think hiruzen can use every single leaf jutsu i think i was just exagerated to really put across just how good he was, i would just like to say even though it doesnt really have anything to do with hiruzen.
wat was said about chakra natures and about how ur second chakra nature cant use S ranked techniques i think it incorrect, through hard training and i mean very hard training they would eventually be able to use high level techniques but because it isnt there dominant chakra element they obvi find it harder to use it than there dominant , take sasuke as an example his dominant nature is fire, yet he is able to use chidori which is lightning, his second affiliated chakra nature which is also an S rank technique.
i know it didnt really have anything to do with hiruzen i just wanted to make it clearer

wat was said about chakra natures and about how ur second chakra nature cant use S ranked techniques i think it incorrect, through hard training and i mean very hard training they would eventually be able to use high level techniques but because it isnt there dominant chakra element they obvi find it harder to use it than there dominant , take sasuke as an example his dominant nature is fire, yet he is able to use chidori which is lightning, his second affiliated chakra nature which is also an S rank technique.
i know it didnt really have anything to do with hiruzen i just wanted to make it clearer